/*
 * #%L
 * sfdc-wsc-tools
 * %%
 * Copyright (C) 2013 salesforce.com, inc.
 * %%
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided
 * that the following conditions are met:
 * 
 * 1) Redistributions of source code must retain the above copyright notice, this list of conditions and the
 *    following disclaimer.
 * 
 * 2) Redistributions in binary form must reproduce the above copyright notice, this list of conditions and
 *    the following disclaimer in the documentation and/or other materials provided with the distribution.
 * 
 * 3) Neither the name of salesforce.com, inc. nor the names of its contributors may be used to endorse or
 *    promote products derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * #L%
 */
package com.sforce.ws.codegen;

import java.io.*;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

/**
 * @author hhildebrand
 * @since 184
 */
class ToolsJarClassLoader extends ClassLoader {

    private JarFile toolsJar;

    ToolsJarClassLoader(ClassLoader parent) throws IOException {
        super(parent);
        String javaHome = System.getProperty("java.home");
        if (javaHome.endsWith("jre")) {
            javaHome = javaHome.substring(0, javaHome.length() - 3);
        }
        if (!javaHome.endsWith("/")) {
            javaHome = javaHome + "/";
        }
        String tj = javaHome + "lib/tools.jar";
        File tjf = new File(tj);
        toolsJar = new JarFile(tjf);
    }

    @Override
    public Class<?> findClass(String name) throws ClassNotFoundException {
        byte[] b;
        try {
            b = getBytes(name);
        } catch (IOException e) {
            throw new ClassNotFoundException(name);
        }
        return defineClass(null, b, 0, b.length);
    }

    private byte[] getBytes(String name) throws IOException, ClassNotFoundException {
        name = name.replace(".", "/");
        name += ".class";
        JarEntry entry = toolsJar.getJarEntry(name);

        if (entry == null) {
            throw new ClassNotFoundException(name);
        }

        InputStream io = toolsJar.getInputStream(entry);

        ByteArrayOutputStream bout = new ByteArrayOutputStream();
        int ch;
        while ((ch = io.read()) != -1) {
            bout.write((char) ch);
        }
        io.close();

        return bout.toByteArray();
    }
}
